hennemann



(No Model.)

. H. B. HENNEMANN. ADJUSTABLE PHOTOGRAPHIG PRINTING FRAME.

No. 454,433. Patented June 16,1891.

WITNESSES E v V .7 V, J/irmemafln wagomut 97 m M ATTOHIVEYJI UNITED.STATES-PATENT OFFICE.

HENRY B. HENNEMANN, OF ST. LOUIS, MISSOURI, ASSIGNOR OF ONE-HALF TO FREDHEILMANN, OF SAME PLACE.

ADJUSTABLE PHOTOGRAPHlC-PRINTING FRAME.

SPECIFICATION forming part of Letters Patent No.454,433, dated June 16,1891. 7 Application filed December 24, 1890. Serial No. 375,694- (Nomodel.)

To all whom it may concern:

Be it known that I, HENRY B. HENNEMANN, of the city ofSt. Louis andState of Missouri, have invented certain new and useful Improvements inAdjustable Photographic- Printing Frames, of which the following is afull, clear, and exact description, reference being had to theaccompanying drawings, forming a part hereof.

My invention relates to improvements in adjustable photographic printingframes; and it consists in the novel arrangement and combination ofparts, as will be more fully hereinafter described, and designated inthe claims.

In the drawings, Figure 1 is a perspective view of my complete inventionwith one of the extensible corners detached. Fig. 2 is a top plan Viewof the frame reduced for the reception of an ordinary cabinet picture.Fig. 3 is a side elevation with one of the sides broken away, showingthe sliding clamp. Fig. 4 is a horizontal section taken on the line m wof 3. Fig. 5 is a side elevation of one of the sliding clamps detached.Fig. 6 is a front elevation of the same. Fig. '7 is a longitudinalsection of the connecting-bar which I employin carrying out myinvention.

The object of my invention is to construct a photographic-printing framecapable of being enlarged or reduced for taking in different sizes ofnegatives, thereby obviating the I necessity which has heretoforeexisted of using separate frames for different sizes. The frame ordevice is so constructed that when it is enlarged or reduced in size itstill retains all the elements of substantiality as would exist in aframe of different size constructed in the ordinary manner.

Referring to the drawings, 1 represents the stationary parts (or pieces)of the frame, and 2 the detachable corners by which when they areconjoined to the stationary part of the frame said frame is enlarged, orbeing detached therefrom the dimensions are dimin ished. The terminalportions of the stationary parts of the frame are provided withT- shapedgrooves 8, in which the base-plates 3 of adjustable sliding clamps atare adapted to freelymove. One of the ends of the stationary pieces 1 ofthe frame is provided with an angular recess 5, adapted'to receive acorresponding projection formed on the ends of the adjustable detachablecorners 2, whereby when said corners are conjoined a more rigidconnection is effected.

6 indicates cleats secured to the stationary pieces of the frame in anysuitable and mechanical manner, the function of which is to hold theends of the semi-elliptic springs 7 in Go a compressed position.

The stationary portions of the frame, as well as the detachable corners,are provided with internal recesses, which serve the ordinary functionsofthe recesses made in ordi- 6 nary printing-framesto wit, the upperrecess is to permit the introduction of the ends of the semi-ellipticsprings under the cleats, and the lower answers for the reception of thecompression-plate 2S. Said compression-plate 7n may be made in differentsections and hinged together, after the usual construction. The terminalportions of the detachable extensible corners 2 are also provided withT-shaped grooves, in which the base-plates of the sliding clamps 4 areadapted to move.

When it is desired to reduce the size of the frame, which is effected bydetaching the corners 2, the operator should unloosen the thumb-screws0, the function of which is to hold the upper plates 10 of clamp-piecesat to the base-plates thereof, the impinging contact between plates 10and the exterior sun faces of the detachable corners is reduced,

and the detachable corners can then be removed. After the detachablecorners have been removed the stationary parts 1 of the frame can be puttogether by the aid of the clamp pieces, after the same manner that thedetachable corners are conjoined to the same.

pression-plate can be used when the frame is As a natural 5 iiienlarged. Although it is hinged together it is made rigid by a slidingbar 11, which is adapted to move in a plate 12, secured to saidcompression-plate. The compression-plate used when the frame is reducedis hinged to a compression-plate of practically the same dimensions aswhen the plate is enlarged, and is hinged thereto by means of adjustablebar 13.

14 indicates plates which are secured to the compression-plate in anysuitable and mechanical manner. Said plates are provided with perforatedprojections 18, through which the ends of the adjustable bar 13 areadapted to be inserted, thereby holding them together in a hingedposition. The adjustable bar 13 is composed of two sections'adapted tomove in a small cylindrical tube 15. Between these sections a spiralspring 16 is interposed, whereby yielding connection is formed betweenthe two sections.

17 represents smaller semi-elliptical springs adapted to be used inholding the compression-plate in its normal position when the frame isreduced. lVhen the frame is enlarged, these small semi-ellipticalsprings can be removed and a large semi-elliptical spring 7 substitutedin lieu thereof.

19 represents the thumb-screws, by which springs 17 and also spring 7are held to the compressi n-plate in their normal position.

The sliding clamps are composed of baseplates 3 and upper plates 10, ashereinbefore stated. To plates 3 and 10 smaller bars 29 are secured,which bars are adapted to move in grooves 8. Plates 3 of theclamp-pieces have screw-threaded stems 20 secured thereto andadapted toreceive thumb-screws 9, whereby said plates 3 and 10 can be drawntogether and hold the parts interposed between them in a substantialmanner.

Having fully described my invention, what I claim is v 1. An adjustablephotographic-printing fram e consisting of stationary and detachablepieces, the terminal portions of which are provided with T-shapedgrooves, and means for holding the said stationary and detach ablepieces together, substantially as set forth.

2. In an adjustable photographic-printing frame, a T-shaped slidingclamp for holding the stationary and detachable pieces together,substantially as set forth.

3. In an adjustable photographic-printing frame, a sliding clampconsisting of a baseplate adapted to move in suitable grooves formed inthe terminal portions of the stationary and adjustable pieces of saidframe, an upper plate provided with a bar adapted to move in saidgrooves, and means for drawing said upper and lower plates together,thereby holding the pieces of the frame interposed between them rigidlyand substantially together, substantially as set forth.

4:- In an adjustable photographic-primting frame, a sliding clampconsisting of a base and an upper plate, each of which is provided witha bar, and a lower plate additionally provided with screw-threaded stemsadapted to receive thumb-screws for holding the stationary anddetachable pieces of said frame together.

5. In an adjustable photographic-printing frame, an adjustable bar forhinging the compression-plates together, substantially as set forth.

(5. In an adjustable photographic-printing frame, an adjustable barcomposed of two sections yieldingly connected for hinging thecompression-plates together, substantially as set forth.

7. In an adjustable photographic-primting frame, an adjustable barconsisting of two sections, a tube for receiving the ends of saidsections, and a spiral spring interposed between the ends of the same,whereby said sections are yieldingly connected, substantially as setforth.

In testimony whereof I affix my signature in presence of two witnesses.

II. B. IIENNEMANN.

Witnesses:

E. E. LONGAN, A. M. EvERIsT.

